Difference Between Conduction, Convection, and Radiation


Introduction about difference between conduction, convection and radiation:-

In a vehicle cooling of water is depends on heat transfer. What is heat transfer and which principles applied on it, we will know. Today we will talk about the three main methods of heat transfer and deployment, so let's know.

To bring the heat from one place to another, it is necessary to have a heat difference so that the heats go from a hot place to a cold place. Which can be solid, liquid and gas.

Method of heat transfer:-

There are total three method for heat transfer which are as follows-
1. Conduction. 
2. Convection. 
3. Radiation. 


Conduction transfers heat through direct molecular collisions. A region of more kinetic energy will transfer thermal energy to a region with less kinetic energy. High-speed particles will collide with slow-motion particles. As a result, slower particles will increase the kinetic energy. 

Difference Between Conduction, Convection, and Radiation

Conduction is the most common form of heat transfer and occurs through physical contact. Examples would be to put your hand against a window or put the metal in an open flame.

The process of heat conduction depends on the following factors: the temperature gradient, the cross-section of the material, the length of the travel path, and the material properties. 

Temperature gradient is the physical quantity that describes the direction and rate of heat travel. The flow of temperature is always from the hottest to the coldest or, as stated earlier, the high to low kinetic energy. 

Once thermal equilibrium occurs between the two temperature differences, thermal transfer stops. Both the cross-section and the route of travel play an important role in conduction. 

The greater the size and length of an object, the more energy required to heat it. And the more exposed the surface area, the more heat is lost. Small objects with small cross-sections have minimal heat loss.

Physical properties determine which materials transfer heat more than others. In particular, the thermal conductivity coefficient determines that a metallic material will conduct better heat than the fabric when it comes to conduction.


When a fluid, such as air or a liquid, is heated and then moves away from the source, it carries thermal energy along. This type of heat transfer is called convection. The fluid expands above a hot surface, becomes less dense, and rises. At the molecular level, molecules expand upon the introduction of thermal energy. 

As the temperature of a given fluid mass increases, the volume of the fluid must increase by a similar factor. This effect on the fluid causes displacement. As the hot air comes out, it pushes condensate, cold air down. This series of events shows how convection currents are formed.


Thermal radiation is produced by the emission of electromagnetic waves. These waves carry energy away from the emitting object. Radiation occurs through a vacuum or any transparent medium (either solid or liquid). Thermal radiation is the direct result of random movements of molecules and molecules in matter. 

The movement of charged protons and electrons results in the emission of electromagnetic radiation. All materials radiate thermal energy based on their temperature. The hotter an object is, the more radiated it is. 

The Sun is a clear example of heat radiation that transports heat throughout the solar system. At normal room temperature, objects radiate as infrared waves. The temperature of the object affects the wavelength and frequency of the irradiated waves. As the temperature rises, 

The wavelength within the spectra of the emitted radiation is reduced and shorter wavelengths are emitted with higher-frequency radiation.

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